CN213545460U - External damage prevention alarm system for underground pipeline - Google Patents
External damage prevention alarm system for underground pipeline Download PDFInfo
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- CN213545460U CN213545460U CN202022311847.5U CN202022311847U CN213545460U CN 213545460 U CN213545460 U CN 213545460U CN 202022311847 U CN202022311847 U CN 202022311847U CN 213545460 U CN213545460 U CN 213545460U
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Abstract
The utility model relates to an external damage alarm system is prevented to underground line, underground line prevent that external damage alarm system includes optical time domain reflectometer, bus optical cable and a plurality of detection subassembly that is used for confirming whether report to the police. The optical pulse output port of the optical time domain reflectometer is connected with a bus optical cable, and the detection assembly is connected on the bus optical cable in series. The detection assembly comprises a T-shaped coupler, an optical fiber woven mesh and a grating identification module, wherein an input port, an output port and a coupling port are arranged on the T-shaped coupler, the input port and the output port of the T-shaped coupler are connected to a bus optical cable, the coupling port of the T-shaped coupler is connected with a first end of the optical fiber woven mesh, and a second end of the optical fiber woven mesh is connected with the grating identification module. The bus optical cable and the optical fiber woven mesh are both located underground, the depth of the optical fiber woven mesh is smaller than that of the bus optical cable, the bus optical cable and the optical fiber woven mesh are both located above an underground pipeline, and the optical time domain reflectometer is located above the ground.
Description
Technical Field
The utility model relates to a light detection field especially relates to an external damage alarm system is prevented to pipeline.
Background
Underground facilities such as underground cables, water supply and drainage pipelines, thermal pipelines, gas pipelines, communication optical cables and the like are important components of urban and rural infrastructure, the facilities are buried underground, the number of the facilities is large, the route is complex, the safe operation of the underground facilities is ensured, and the important content of safe production work is provided. In addition to natural disasters, the external human factors except underground facility slopes are mainly illegal excavation and rough construction, which easily cause damage to lines, pipelines and other facilities, thereby seriously threatening the safety of lives and properties of people. Therefore, the external force damage prevention work for the underground facilities must be continuously promoted and perfected, so that an advanced sensing technology alarm system is required to be developed and adopted to monitor the periphery of the underground facilities in real time, early warn the possible damage behaviors in advance, avoid damage and further ensure the safe operation of the underground facilities, and the existing alarm system has the problems of complex structure and high cost.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
The utility model provides an external damage alarm system is prevented to pipeline aims at solving among the prior art alarm system structure complicacy and problem with high costs.
(II) technical scheme
In order to solve the above problems, the present invention provides an alarm system for preventing external damage of an underground pipeline, which comprises an optical time domain reflectometer, a bus optical cable and a plurality of detection assemblies for determining whether to alarm;
the optical pulse output port of the optical time domain reflectometer is connected with the bus optical cable, and the detection assembly is connected on the bus optical cable in series;
the detection assembly comprises a T-shaped coupler, an optical fiber woven mesh and a grating identification module, wherein the T-shaped coupler is provided with an input port, an output port and a coupling port, the input port and the output port of the T-shaped coupler are connected to the bus optical cable, the distance between adjacent T-shaped couplers on the bus optical cable is larger than the minimum resolution of the optical time domain reflectometer, the coupling port of the T-shaped coupler is connected with the first end of the optical fiber woven mesh, the second end of the optical fiber woven mesh is connected with the grating identification module, and the grating identification module can reflect a characteristic identification signal to the optical time domain reflectometer after receiving optical pulses transmitted by the optical time domain reflectometer;
the bus optical cable and the optical fiber woven mesh are located underground, the depth of the optical fiber woven mesh is smaller than that of the bus optical cable, the bus optical cable and the optical fiber woven mesh are located above the underground pipeline, and the optical time domain reflectometer is located above the ground.
Preferably, the optical time domain reflectometer is capable of alternately transmitting light pulses of a first wavelength band and a second wavelength band;
the grating identification module comprises an identification optical fiber, a plurality of coding bits are arranged on the identification optical fiber, and the coding bits comprise one of four conditions of a grating engraved with a first waveband, a grating engraved with a second waveband, a grating engraved with the first waveband and a grating engraved with the second waveband at the same time, or no grating.
Preferably, any two adjacent coded bits on the identification fiber are equidistant from each other on the identification fiber.
Preferably, the distance between two adjacent coded bits on the identification fiber is not less than the minimum resolution of the optical time domain reflectometer.
Preferably, the number of coded bits on the identification fiber is 4-6.
Preferably, in the underground pipeline external damage prevention alarm system, the number of the coding bits on any two identification optical fibers is the same, and the combination conditions of the coding bits on any two identification optical fibers are different.
Preferably, the first wavelength band is 1310nm and the second wavelength band is 1550 nm.
Preferably, the alarm system for preventing the underground pipeline from being damaged by the external force further comprises a computing center, and the computing center is connected with the optical time domain reflectometer.
Preferably, the optical time domain reflectometer comprises a pulse generator, a laser diode, an optical fiber connector, a clock generator, an optical coupler, a photodetector, an optical amplifier, a control and signal processing module;
one end of the optical fiber connector is connected with the bus optical cable, the other end of the optical fiber connector is connected with the optical coupler, and the optical coupler is respectively connected with the laser diode and the photoelectric detector;
the input end of the laser diode is connected with the pulse generator, the clock generator can be communicated with the pulse generator and the optical amplifier, and the control and signal processing module is connected with the photoelectric detector through the optical amplifier;
the control and signal processing module is in communication connection with the computing center.
Preferably, the optical fiber woven mesh is formed by fixing a non-metal armored optical cable through a plurality of mesh buckles.
(III) advantageous effects
The utility model discloses a set up the in service behavior that the optic fibre woven mesh is used for monitoring the underground line in underground line's top, still connect a plurality of optic fibre woven meshes through a bus optical cable simultaneously, make the utility model discloses an early warning wide range, simple structure. Meanwhile, the depth of the bus optical cable is greater than that of the optical fiber woven mesh, so that the bus optical cable is protected to a certain extent, the service life of the bus optical cable is prolonged, and the cost is reduced.
Drawings
FIG. 1 is a schematic structural view of an external damage prevention alarm system for underground pipelines according to the present invention;
FIG. 2 is a schematic structural diagram of a woven optical fiber mesh of the present invention;
FIG. 3 is a schematic view of the installation positions of the optical fiber woven mesh and the bus cable according to the present invention;
fig. 4 is a schematic structural diagram of the identification optical fiber according to the present invention;
fig. 5 is a schematic diagram of the mechanism of the middle optical time domain reflectometer of the present invention.
[ description of reference ]
1: an optical time domain reflectometer; 11: a pulse generator; 12: a laser diode; 13: an optical fiber connector; 14: a clock generator; 15: an optical coupler; 16: a photodetector; 17: an optical amplifier; 18: a control and signal processing module; 2: a bus cable; 3: a detection component; 31: a T-shaped coupler; 32: weaving a fiber mesh; 320: net buckling; 33: a grating recognition module; 330: identifying an optical fiber; 4: and calculating the center.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Example 1:
as shown in fig. 1 and 3, the utility model provides an external damage alarm system is prevented to underground pipeline, underground pipeline prevent that external damage alarm system includes optical time domain reflectometer 1, bus optical cable 2 and a plurality of detection subassembly 3 that are used for confirming whether report to the police. The optical pulse output port of the optical time domain reflectometer 1 is connected with a bus optical cable 2, and the detection component 3 is connected on the bus optical cable 2 in series.
The detection assembly 3 comprises a T-shaped coupler 31, an optical fiber woven mesh 32 and a grating identification module 33, wherein an input port, an output port and a coupling port are arranged on the T-shaped coupler 31, the input port and the output port of the T-shaped coupler 31 are connected to the bus optical cable 2, the distance between adjacent T-shaped couplers on the bus optical cable is larger than the minimum resolution of the optical time domain reflectometer, and the minimum resolution of the optical time domain reflectometer is the minimum distance which can be resolved by the optical time domain reflectometer. The coupling port of the T-type coupling is connected to the first end of the fiber-optic woven network 32, the second end of the fiber-optic woven network 32 is connected to the grating recognition module 33, and the grating recognition module 33 can reflect a feature recognition signal to the optical time domain reflectometer 1 after receiving the optical pulse transmitted by the optical time domain reflectometer 1.
In the present embodiment, the optical pulses emitted by the optical time domain reflectometer 1 are distributed via the T-couplers 31 connected in series to the bus cable 2, and a detection light is split (the light intensity of the detection light is only a small proportion of the optical pulses emitted by the optical time domain reflectometer 1, preferably 1:32), and most of the rest is distributed to the next T-coupler 31 until the last T-coupler 31. The detection light enters the grating recognition module 33 after traveling from the first end of the fiber-optic woven mesh 32 to the second end of the fiber-optic woven mesh 32, and the grating recognition module 33 reflects a characteristic recognition signal to the optical time domain reflectometer 1. Wherein the utility model discloses the characteristic identification signal that two arbitrary grating identification module 33 reflect is all inequality.
The bus optical cable 2 and the optical fiber woven network 32 are both located underground, the depth of the optical fiber woven network 32 is smaller than that of the bus optical cable 2, the bus optical cable 2 and the optical fiber woven network 32 are both located above an underground pipeline, and the optical time domain reflectometer 1 is located above the ground. The region that optic fibre woven mesh 32 covered is exactly the protection area who needs the early warning, and when optic fibre woven mesh 32 in the protection area was destroyed by external force, the characteristic identification signal of grating identification module 33 reflection just can not be received by optical time domain reflectometer 1, just considers the protection area to be destroyed this moment, the utility model discloses the underground pipeline prevents that external force from destroying alarm system just starts the warning flow. Because the optical fiber mesh grid 32 still has a section distance apart from the pipeline, external damage alarm system is prevented to underground line can report to the police in advance before the pipeline is broken to external force, same reason, underground line prevents that external damage alarm system can report to the police when external force destroys bus optical cable 2, so can not appear after optical fiber mesh grid 32 of a department is destroyed, influence the condition of seting up defences and warning of other mesh grids, system robustness is high, whole underground line prevents that external damage alarm system is simple structure, high durability and low cost.
Example 2:
the optical time domain reflectometer 1 is capable of alternately emitting optical pulses in a first wavelength band and in a second wavelength band. The grating identification module 33 includes an identification fiber 330, the identification fiber 330 is provided with a plurality of encoding bits, and the encoding bits include one of four cases, i.e., a grating engraved with a first waveband, a grating engraved with a second waveband, a grating engraved with the first waveband and a grating engraved with the second waveband at the same time, and no grating. Any two adjacent coded bits on the identification fiber 330 are equidistant from each other on the identification fiber 330. The distance between two adjacent coded bits on the identification fiber 330 is not less than the minimum resolution of the optical time domain reflectometer 1. The number of coded bits on the identification fiber 330 is 4-6, considering the factors of the whole power attenuation, the length of the identification fiber 330 (relating to the volume of the packaging protection structure) and the resolution of the economical optical time domain reflectometer 1. The first wavelength band is preferably 1310nm and the second wavelength band is preferably 1550 nm.
Since the grating of the first band reflects only the optical pulse of the first band, the grating of the second band reflects only the optical pulse of the second band, the head end of the identification fiber 330 is connected to the second end of the fiber-woven mesh 32, the tail end of the identification fiber 330 can also reflect the optical pulse, and the signal reflected by the tail end of the identification fiber 330 is greatly different from the signal reflected by the grating, the position of the code bit on the identification fiber 330 is calibrated according to the tail end of the identification fiber 330. The number of the coding bits on any two identification fibers 330 in the alarm system for preventing the external damage of the underground pipeline is the same, and the combination conditions of the coding bits on any two identification fibers 330 are different.
Identifying the combination of coded bits on the fiber 330 means: as shown in fig. 4, the identification fiber 330 is provided with 4 encoding bits, the four encoding bits are A, B, C and D, D is the encoding bit closest to the end E of the identification fiber 330, and each encoding bit has four cases (four cases of a grating engraved with a first waveband, a grating engraved with a second waveband, a grating engraved with the first waveband and the second waveband simultaneously, and a no grating), so that the combination of the encoding bits of the identification fiber 330 can have 4-power combination cases in the sequence of ABCD. The utility model discloses in, each 3 distances of detection subassembly apart from optical time domain reflectometer 1 all inequality, so the signal of each 3 reflections of detection subassembly is also different by the time that optical time domain reflectometer 1 received, secondly because the combination condition of the coding bit on two arbitrary discernment optic fibre 330 is all inequality, and the distance between two adjacent coding bits is not less than optical time domain reflectometer 1's resolution ratio on the discernment optic fibre 330. When the optical time domain reflectometer 1 alternately emits optical pulses of two wavelength bands 1310nm and 1550nm, it is known which signal is reflected by the identification optical fiber 330 based on the signal reflected by the end of the identification optical fiber 330, the signal reflected by the encoded bit, and the time when each reflected signal reaches the optical time domain reflectometer 1. The characteristic identification signal reflected by the grating identification module 33 in embodiment 1 includes: the signals reflected by the end of the fibre 330, the signals reflected by the encoded bits and the time information when each reflected signal reaches the optical time domain reflectometer 1 are identified. The optical time domain reflectometer 1 only detects the existence or nonexistence of the grating reflection characteristic signal, adopts the identical grating, has low technical requirement of writing and is convenient for batch manufacturing.
Example 3:
as shown in fig. 1 and 5, the alarm system for preventing the underground pipeline from being damaged by the external force further comprises a computing center 4, and the computing center 4 is connected with the optical time domain reflectometer 1.
The optical time domain reflectometer 1 comprises a pulse generator 11, a laser diode 12, an optical fiber connector 13, a clock generator 14, an optical coupler 15, a photo detector 16, an optical amplifier 17, a control and signal processing module 18. One end of the optical fiber connector 13 is connected to the bus cable 2, and the other end of the optical fiber connector 13 is connected to the optical coupler 15, and the optical coupler 15 is connected to the laser diode 12 and the photodetector 16, respectively. The input of the laser diode 12 is connected to the pulse generator 11, the clock generator 14 is able to communicate with the pulse generator 11 and the optical amplifier 17, and the control and signal processing module 18 is connected to the photodetector 16 through the optical amplifier 17. The control and signal processing module 18 is connected in communication with the computing center 4. The computing center 4 may be a computer, an upper computer or a cloud server.
Compared with a distributed vibration optical fiber detection system or an optical fiber grating vibration detection system which adopts a complex vibration signal detection optical path and a high-speed data acquisition circuit, the system has the advantages of remarkably reducing the cost, greatly simplifying the system, having high reliability, being convenient for large-scale popularization, being also convenient for field deployment, being convenient for field deployment by combining power supply modes such as solar energy and the like, and solving the power supply problem of remote areas by using the existing optical time domain reflectometer 1 and a computer which can alternatively emit optical pulses of two wave bands as a detection core.
Example 4:
as shown in fig. 2, the optical fiber woven mesh 32 is formed by fixing a non-metal armored optical cable through a plurality of mesh buttons 320. Just is in the utility model discloses the length of constituteing the nonmetal armor optical cable in two arbitrary fiber woven meshes equals among the pipeline anti external force damage alarm system. A plurality of net buckles 320 are utilized to weave a non-metal armored optical cable into a net, the structure is simple, the weaving cost is low, the optical cable knotting and small-radius bending are avoided, and meanwhile, large-scale automatic production is easy to carry out.
The optical fiber mesh grid 32 may be a multi-segment folded by a non-metal armored optical cable, and a plurality of paired locking points are disposed on two adjacent segments, and each pair of locking points is fastened together by a mesh fastener 320.
It should be understood that the above description of the embodiments of the present invention is only for illustrating the technical lines and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention accordingly, but the present invention is not limited to the above specific embodiments. All changes and modifications that come within the scope of the claims are to be embraced within their scope.
Claims (10)
1. An underground pipeline external damage prevention alarm system is characterized by comprising an optical time domain reflectometer, a bus optical cable and a plurality of detection assemblies for determining whether to alarm or not;
the optical pulse output port of the optical time domain reflectometer is connected with the bus optical cable, and the detection assembly is connected on the bus optical cable in series;
the detection assembly comprises a T-shaped coupler, an optical fiber woven mesh and a grating identification module, wherein the T-shaped coupler is provided with an input port, an output port and a coupling port, the input port and the output port of the T-shaped coupler are connected to the bus optical cable, the distance between adjacent T-shaped couplers on the bus optical cable is larger than the minimum resolution of the optical time domain reflectometer, the coupling port of the T-shaped coupler is connected with the first end of the optical fiber woven mesh, the second end of the optical fiber woven mesh is connected with the grating identification module, and the grating identification module can reflect a characteristic identification signal to the optical time domain reflectometer after receiving optical pulses transmitted by the optical time domain reflectometer;
the bus optical cable and the optical fiber woven mesh are located underground, the depth of the optical fiber woven mesh is smaller than that of the bus optical cable, the bus optical cable and the optical fiber woven mesh are located above the underground pipeline, and the optical time domain reflectometer is located above the ground.
2. The underground utility damage prevention alarm system of claim 1, wherein:
the optical time domain reflectometer can alternately transmit light pulses of a first wave band and a second wave band;
the grating identification module comprises an identification optical fiber, a plurality of coding bits are arranged on the identification optical fiber, and the coding bits comprise one of four conditions of a grating engraved with a first waveband, a grating engraved with a second waveband, a grating engraved with the first waveband and a grating engraved with the second waveband at the same time, or no grating.
3. The underground utility damage prevention alarm system of claim 2, wherein any two adjacent code bits on the identification fiber are equidistant from the identification fiber.
4. The underground utility damage prevention alarm system of claim 3, wherein the distance between two adjacent coded bits on the identification fiber is not less than the minimum resolution of the optical time domain reflectometer.
5. The underground utility damage prevention alarm system of claim 3, wherein the number of coded bits on the identification fiber is 4-6.
6. The underground pipeline external damage prevention alarm system according to any one of claims 2-5, wherein the number of the coded bits on any two of the identification optical fibers in the underground pipeline external damage prevention alarm system is the same, and the combination of the coded bits on any two of the identification optical fibers is different.
7. The underground utility damage prevention alarm system of any one of claims 2-5, wherein the first wavelength band is 1310nm and the second wavelength band is 1550 nm.
8. The underground utility damage prevention alarm system of any one of claims 1-5, further comprising a computing center connected to the optical time domain reflectometer.
9. The underground utility damage alarm system of claim 8, wherein the optical time domain reflectometer includes a pulse generator, a laser diode, an optical fiber connector, a clock generator, an optical coupler, a photodetector, an optical amplifier, a control and signal processing module;
one end of the optical fiber connector is connected with the bus optical cable, the other end of the optical fiber connector is connected with the optical coupler, and the optical coupler is respectively connected with the laser diode and the photoelectric detector;
the input end of the laser diode is connected with the pulse generator, the clock generator can be communicated with the pulse generator and the optical amplifier, and the control and signal processing module is connected with the photoelectric detector through the optical amplifier;
the control and signal processing module is in communication connection with the computing center.
10. The underground utility damage prevention alarm system of any one of claims 1-5, wherein the woven fiber optic network is formed by a non-metallic armored fiber optic cable secured by a plurality of network fasteners.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022311847.5U CN213545460U (en) | 2020-10-16 | 2020-10-16 | External damage prevention alarm system for underground pipeline |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022311847.5U CN213545460U (en) | 2020-10-16 | 2020-10-16 | External damage prevention alarm system for underground pipeline |
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| CN213545460U true CN213545460U (en) | 2021-06-25 |
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| CN202022311847.5U Expired - Fee Related CN213545460U (en) | 2020-10-16 | 2020-10-16 | External damage prevention alarm system for underground pipeline |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117392796A (en) * | 2023-12-11 | 2024-01-12 | 云南保利天同水下装备科技有限公司 | Partition detection method, partition detection system and defense detection assembly thereof |
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2020
- 2020-10-16 CN CN202022311847.5U patent/CN213545460U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117392796A (en) * | 2023-12-11 | 2024-01-12 | 云南保利天同水下装备科技有限公司 | Partition detection method, partition detection system and defense detection assembly thereof |
| CN117392796B (en) * | 2023-12-11 | 2024-03-22 | 云南保利天同水下装备科技有限公司 | Partition detection method, partition detection system and defense detection assembly thereof |
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